A very fine Helmet indeed... Is the unit 10/128 ? I find the red stripe to be very open to guessing... and really dont buy the wound theory... It is possible that it was simply done within a single Battalion of a certain regiment and we will never find the reason behind them. My guess, based on assumption but hopefully just as valid as anyone elses, is that it was used for identification within a unit? Either to show which part of the unit....Maybe 1st section one stripe, 2nd section two, etc... Or the function of the wearer... Grenade throwers one stripe, Messengers two stripes etc (Once gasmasks were being worn a Junior officer would have trouble picking out the functions of his men ? So it would have been much easier if he knew one stripers carried messages, two stripers were MG08/15 team, etc. etc...